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Bug 1205109: Make `pushsubscriptionchange` extendable.

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<head>
  <title>Test for Bug 1205109</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="text/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
  <script type="text/javascript" src="/tests/dom/push/test/test_utils.js"></script>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1205109">Mozilla Bug 1205109</a>
<p id="display"></p>
<div id="content" style="display: none">

</div>
<pre id="test">
</pre>

<script class="testbody" type="text/javascript">

  var registration;
  add_task(function* start() {
    yield setupPrefsAndMockSocket(new MockWebSocket());
    yield setPushPermission(true);

    var url = "worker.js" + "?" + (Math.random());
    registration = yield navigator.serviceWorker.register(url, {scope: "."});
    yield waitForActive(registration);
  });

  var controlledFrame;
  add_task(function* createControlledIFrame() {
    controlledFrame = yield injectControlledFrame();
  });

  add_task(function* togglePermission() {
    var subscription = yield registration.pushManager.subscribe();
    ok(subscription, "Should create a push subscription");

    yield setPushPermission(false);
    var permissionState = yield registration.pushManager.permissionState();
    is(permissionState, "denied", "Should deny push permission");

    var subscription = yield registration.pushManager.getSubscription();
    is(subscription, null, "Should not return subscription when permission is revoked");

    var changePromise = controlledFrame.waitOnWorkerMessage("changed");
    yield setPushPermission(true);
    yield changePromise;

    subscription = yield registration.pushManager.getSubscription();
    is(subscription, null, "Should drop subscription after reinstating permission");
  });

  add_task(function* unsubscribe() {
    controlledFrame.remove();
    yield registration.unregister();
  });

</script>
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</html>
